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Additionally, for a data set to be considered complete, the data set must contain all QC check analyses verifying precision, accuracy, and sensitivity for the analytical protocols. This will be determined during the data validation process. Following data validation and usability assessment, the percent completeness can be calculated. A2.0 LABORATORY AND INTERNAL QUALITY CONTROL CHECKS The analytical laboratories will follow their quality control procedures and analyzed the following QC samples as part of their internal procedures. A2.1 Field and Laboratory QC Samples The following QC samples will be prepared by the laboratory: laboratory replicates, MSs, method blanks, and method-specific QC samples. The following provides a summary of these different types of QC samples. Laboratory Replicates: Laboratory replicates are used to measure the contribution of the analytical process to the overall imprecision of data. Laboratory replicates are employed for inorganic analyses, while MSDs are used to measure the analytical imprecision of organic methods. Laboratory replicates will be analyzed at the frequency of 1 per 20 samples. MSDs will be analyzed at the rate of 1 per 20 samples or 1 per sampling event, whichever is greater. Matrix Spikes: MSs are aliquots of field samples that are spiked with a known amount of standard. The unspiked and spiked aliquots are analyzed and the recovery of the spiked standard is determined. The recovery is used to approximate the analytical bias of the method. MSs will be analyzed at the rate of 1 per 20 samples or 1 per sampling day, whichever is greater. Method Blanks: Laboratory method blanks are used to assess laboratory contamination during performance of a method. Laboratory method blanks will be run at a minimum frequency of 1 per 20 samples or one per day. A2.2 Data Validation Procedures Data validation is performed on the project analytical data when the final analytical report is received by LFR. The data validation will include a data completeness review of each data package, and a review of QA/QC parameters as described in this appendix and as indicated in the National Functional Guidelines to ensure that all project analytical data are of reliable and comparable data quality. Specifically, the following QA/QC parameters will be reviewed: C holding times (to assess potential for degradation that will affect accuracy) blanks (to assess contamination for all compounds) Sampling Plan for Small Waste Disposal Areas(final).doc A-7